Geophysicists of NIO have written a monograph titled 'Tectonics of the Eastern Continental Margin of India ' recently and published by the TERI press. It presents the different aspects of a passive margin such as its evolution, tectonics, and associated hazards, taking the Eastern Continental Margin of India (ECMI) as a case study. It also discusses the passive margin and focuses on its origin, morphology, structure, and exploration potential; describes the major structural lineaments delineated from the geophysical data over the ECMI; and attempts to explain the geodynamic evolution of this passive margin. A preliminary estimate on the seismic hazards associated with ECMI is also presented in the book. The authors hope that the book would be useful for students of geosciences and in the field of marine geophysics in particular and also serve as a useful database for exploration agencies in their search for hydrocarbons.